Fuel supply system



Oct. 27, 1959 w. c. SUTTLE FUEL SUPPLY SYSTEM :5 Sheets-Sheet 1 Filed March 12, 1958 INVENTOR. MRO 6. 507744:

Oct. 27, 1959 w. c. SUTTLE FUEL SUPPLY SYSTEM 3 Sheets-Sheet 2 Filed March 12, 1958 a M g INVENTOR. I WMO 6. 507725 6 B ATTOP/Vi) Oct. 27, 1959 w. c. SUTTLE 2,910,057

FUEL SUPPLY SYSTEM Filed March 12, 1958 5 Sheets-Sheet 5 INVENTOR.

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4 rue/var 2,910,055 FUEL SUPPLY SYSTEM Ward CgSuttlg-Southlind, Ind., assignor to Bendix Aviation Corporation, South Bend, Ind., a corporation or Delaware .x iii'cstion Maich- 12,- 1958, Serial No 720,905 scisiins. (ct. 125-140 engine; When'tHe throttle-is opened rapidly it is difficult too h a 'sufiiciently rapidresponse from the'pum'p eewrotiiieiiiber to increase the fuel s pply in proportion' to the increase in air'supply.

It is ari -object-of the-present invention to provide in a fuel siipply syster'n 'a control to produce a desired fuel are mixture during acceleration.

Other obje'sts-'ahd advahtages'oi the resent invention wiii tseeoihe appa'rent'dining the course'of the following reference being h'ad thereinto the accompanying drawings, in which:

Fig'ur'e ris-a viewpai-tlyinsection of a fuel injection Figures is" a "schematic-view partially in section of the valve showh iii Fi ure 2 Figure 4 is a schematic view partially in section of the dashpotsh'owh' inFi urez; and

Figure 5 is a sectional view taken along line 5-'5 new to thedrawings and more particularly there isshowiiavariable displacement fuel injection piimpj'mhavin a'con'trol device 46 including ae'oiitroI meniher 9s operativety connected to'the ump forvarying th'e displacement there'of and induction pressure respohsive r'n'e'arisor piston 50 operatively connected United States Patent ice Patented Oct. 27, 1959 throttle shaft; Loose level" 132 is connectedtdone end of a floating lever 134*by means of a rod 136; ac celerating pedal-or" control member 138 is connected to the floating lever134 intermediate its ends by an actuating member 140. The other end of' floating level 134 is pivotallyc'onnected to stern 1420f valve 144'vvhich'is mounted ina housing 146. The interior ofhousin'gil tii is connected to the pump prjessure'fresponsiv'e controlsll by means of conduit 60. Conduit idsconne'cts the'inf te'rio'r or housi n'g'146with' the 'indu'ction passage ig'z downstream of"thrdttlevalve'124.' A vent 150 normally exposed to substantially atmospheric r ssure is provided with a'seat152 against which valve 144 is urged by means of spring 154; Conduit 148 is provided with a sea't156 which is adapted'to receive-the valve member 144; I

Throttle 124 iscon'nected to a dashpot 150 bymeans of throttle shaft 126, lever 162, 'rod 164'a'nd crank166. As best shown in Figure 4 dashpot 160 is provided'with a 'st'epped'cylinde'r"168 having a first diameter portion 17d and a second larger diameter portion 172. Apiston is rec'ipro'cably mounted-'in' cyl'inder 1'6'8aiid is urged to normally assume a position Within the first diameter po'rtioh170 by a spring 176. A pass'age 1'78flis formed in the-piston andop'ens atone end-180irian endo'f piston 174 and opens at the othereiid' 182 into a groove 1'34 fo isi dia th'e' side wall o'f pis'ton-174 and sp'a ed-rrom the end] thereof. A restricted assagewa ise'eomieets I the roove 184' with the eiid; ofthe pistonto membe'r'- 98" for actuatin same. Pres urer spoiisive means =includes a piston'orniov'able wall 56 mounted in 'a"ey linder"58; Piston '56 is" subject ed'to'induction passageor manifoId'pressure-through conduits 60 and 62" which o'pe'n i'n'to 'cyl'in'der sfi A spring or resilient inem'ber6'4 'l'o'catedin cylinder 58* exerts a force on piston 56in opposition to the force of manifoldp'ressure,

Pump 'lil is supplied with fuel fro'rri a suitable source (not shown) th-r'oughinlet 106 and is discharged un'der pressure-throughoutlets 120 which are adapted for connectionwith appropriate fuel nozzlest'not'shown) which may be locatedin the induction passage or cylinders of the engine to"whi ch the fuel injection system is adapted to supply fuel. I I

As best seen in Figure 2, the internal combustion engine to the presentfuel injection system is adapted to supp y fuel is provided" with an induction passage 1 22 mn'ga throttle 124 moun ed on a shaft 126 therein.

12? see'uied by meansot to'r'sion spring 130 -to a loose lever 132 which is rotatably' mounted on the Crank-166 is provided with aone wayconnection with abutment- 1922 v The cylinder 168 is filled with a" liquid which when'tt'iepist'on 174 ifsmoved downwardly may pass through'restricted passagevvay 186, passage 178' to a conduit 194foireturn to the cylinder through" check valve 196. The pist6n 174 is positioned in' 'cylindr 16 8 bym'eans f theadju'stable abutment 192 so that a predetermined" throttle opening is requiredto move the piston l74 fioni' thefirst' diameter portion to a position' wherein thegroov'e' 184is' iii eommn'iiicationwith the" second' larger diameter" portion 172' of the cylinder 168*. By arrangement a 'two'; stage dashing-ac'tion" is rovided. The first' tage'produ ng th'e greatest retarding action on throttle opening whenthe iston is whol-ly with in the first diametei'po'rtioir170; and-'the second-stage producing a smaller retarding action when theg'roove' 183' in piston 174 enters into'coninfunicatioh iwitl'rthe' second larger diameter portion" of cylinder I681 In operationthe displ'acehreht" oi efieetive; voluine dis' charge of the om-p 10 isvar'ie'd by 'n's of'carnorcon trol'anembe'r 98 whishisaetuat'edbyt 'induetionpas' e pressure responsive means- 50. Sp'rin'g64 di ges theies: sure responsive piston 56 to move cam" 98fovvard extremep'osi'tion for p'r'odu'cing' 'rfiakiniurfidisplacement or volume discharge. Inductiorrpassage pressure actingon piston '56" urges the istonin a direetio'nto move eti'ntrol member 98 toward the" other of its "extreme positions or minimum displacement or volume discharge; Thus when theinduction p'a'ssa'ge absolute pressure is highthe' pump will bepo'sitioned in the full stroke or maximum displace ment position. I

In the present'i'nvention when the throttle-is opened to acceleratethe engine the pump ispiasitionecliir or near its full stroke position'in-adva'nce ofthrottle move ment The time duration that the pump remainsin the full stroke position for acceleration depends on the--position of the throttle when theaccelerator pedal is actuated, the amount of travel of the accelerating pedal, and the velocity of accelerator pedal travel. When the accelerator pedal 138 is depressed the floating lever 14"is moved to the right as shown iri'Fi'gureiwhe'reby the val'v' 14 th seated 011 seat 7156 and ves 1*50is eonne' tedfto the in pressure responsive means 50 then moves the piston 56 to move the pump towards its maximum stroke position. Floating lever 134 also actuates loose lever 132 to urge the throttle 124 toward open position through the torsion springconnection- 130 with throttle lever 128. Dashpot 160 resists the opening of throttle 124 and causing the spring 130 to wind up. The spring 130 gradually unwinds moving throttle 124 toward the selected open position in opposition to dashpot 160. When the spring 130 has unwound and throttle 124 has been open to the selected position the spring 154 is effected to movevalveilfl to seat on the vent seat 152 whereby the pressureresponsive means 50 is again connected to the induction passage through conduits 60 and 148.

Although only one embodiment of my invention has been described, it will be understoodby those skilled in the art that the objects of the invention may be attained by the use of other constructions difierentin certain respects from that disclosed without departing from the underlying principles of the invention.

I claim: 1. In a fuel supply system for an internal combustion engine having an induction passage with a throttle mounted thereinon a shaft, a variable displacement fuel supply pump adapted to be connected to said engine, a control member operatively connected to said pump for varyingv the displacement thereof, means responsive to induction passage pressure operatively connected to said member for urging said member in a direction to decrease the displacement of said pump, resilient means operatively connected to said member for urging said member in a direction to increase the displacement of actuating member is moved in a throttle opening direction.

3. In a fuel supply system for an internal combustion engine having an induction passage with a throttle mounted therein, a variable volume discharge pump, an outlet for said pump, means adapted to connect said outlet to said engine, control means operatively connected to said pump for varying the discharge therefrom, induction passage pressure responsive means operatively connected to said control means for urging said control means towards one of its extreme positions, a housing, means connecting said housing to said pressure responsive means, a conduit adapted to connect said housing to said induction passage, a vent in said housing exposed to substantially atmospheric pressure, a valve for selectively connecting said pressure responsive means to said conduit and vent, a throttle lever operatively connected to said throttle, a floating lever operatively connected to 'said valve and throttle lever, an actuating member operatively connected to said floating lever for moving said valve to a position to connect said pressure responsive means to said vent when said actuating member is moved ina throttle opening direction. I

4. In a fuel supply system for an internal combustion engine having an induction passage with a throttle mounted therein, a variable volume discharge pump; an outlet for said pump; meansadapted to connect said outlet to said engine, control means operatively connected said pump, a throttle lever fixed to said shaft, a loose lever rotatably mounted on said shaft, a resilient connection between said levers, a floating lever, a housing, means connecting one end of said floating lever to said loose lever, a conduit adapted to connect said pressure responsive means to said induction housing, means connecting said housing to said passage, an atmospheric vent means in said housing, a valve in said housing movable to first and second positions to respectively connect said pressure responsive means to said vent means and said conduit, means connecting said valve to theother end of said floating lever, an actuating member connected to said floating lever intermediate its ends, a cylinder having a first diameter and a second largerdiameter, a piston in said cylinder, a passage in said piston opening in one end of said piston and in the side wall of said piston spaced from the other end thereof, a passageway connecting said passage with the other end of said piston, a restriction in said passageway adjacent said other end, resilient means in said cylinder urging said piston to a position normally within said first diameter portion ofrsaid cylinder, and means operatively connecting said throttle shaft with said piston.

2. In a fuel supply system for an internal combustion engine having an induction passage, with a throttle mounted therein, a variable volume discharge pump; an outlet for said pump; means adapted to connect said outlet to said engine; control means operatively connected to said pump for varying the discharge therefrom; induction passage pressure responsive means operatively connected to said control means for urging said control means towards one of its extreme positions; a housing; a conduit adapted to connect said housing to said induction passage; a vent in said housing exposed to substantially atmospheric pressure; means for selectively connecting said pressure responsive means to said conduit and vent; a spring normally urging said last mentioned means in direction to connect said pressure responsive means to to said pump for varying'the discharge therefrom; induction passage pressureresponsive.means operatively connected to said control means for urging said control means towards one ofits extreme positions; resilient means urging said control means toward the other of its extreme positions; a housing; means connecting said housing to said pressure responsive means; a conduit adapted to connect said housing to said induction passage; vent in said housing means exposed to substantially atmospheric pressure; a valve movable to alternatively connect saidpressure responsive means to said conduit and vent means; an actuating member; means connecting said member, said valve and said throttle to move said valve in a direction to connect said pressure responsive means with said vent means in advance of throttle movement when said actuating member is moved in a throttle opening direction.

5. In a fuel supply system for an internal combustion engine having an induction passage with a throttle mounted therein; a variable volume discharge pump; an outlet for said pump; means adapted to connectsaidoutlet to said engine; control means operatively connected to said pump for varying the discharge therefrom; induction passage pressure responsive means operatively connected to said control means for urging said control means toward one of its extreme positions; a housing; means consaid conduit; an actuating member; means connecting meeting said housing to said pressure responsive means; a conduit adapted to connect said housing to said induction passage; vent in said housing means exposed to substantially atmospheric pressure; a valve for selectively connecting said pressure responsive means to said conduit and vent means; resilient means normally urging said valve in a direction to connect said pressure responsive means to said conduit; a throttle lever; resilient means operatively connecting said throttle lever with said throttle; a dashpot having a first stage and a second stage, said second stage being less elfective than said first stage; means operatively connecting said throttle with said dashpot for actuating said dashpot in said first stage until said throttle is opened a predetermined amount; an actuating member; means operatively connecting said actuating member, said throttle and said throttlelever to move said valve to at least momentarily connect said pressure responsive means to said vent in advance of throttle movement when said actuating member is moved in a throttle opening direction. I

6. In a fuel supply system for an internal combustion engine having an induction passage with a throttle mounted therein; a variable volume discharge pump; an outlet for said pump; means adapted to connect said outlet to said engine; control means operatively connected to said pump for varying the discharge therefrom; induction passage pressure responsive means operatively connected to said control means for urging said control means toward one of its extreme positions; a housing; means connecting said pressure responsive means to said housing; a conduit adapted to connect said housing to said induction passage; vent in said housing means exposed to substantially atmospheric pressure; a valve for selectively connecting said pressure responsive means to said conduit and vent means; a throttle lever; resilient 15 means operatively connecting said throttle lever with said throttle; a dashpot operatively connected to said throttle for retarding the opening movement thereof during at least a predetermined range of throttle movement; an actuating member; and means operatively connecting said actuating member, said valve and said throttle lever to move said valve to connect said pressure responsive means to said vent means when said actuating member is moved in a throttle opening direction.

References Cited in the file of this patent FOREIGN PATENTS 967,033 France Mar. 22, 1950 

